Smart LTE Module Series
Smart EVB User Guide
Smart_ EVB_User_Guide
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3.9. UART Interfaces (J901/J604)
Smart EVB provides two UART interfaces: main UART port J901 and debug UART port J604. The debug
UART interface is intended for data transmission and AT command communication. And the main debug
UART interface is not used by default.
The following figure and table show the block diagram of debug UART port J604 and the pin assignment
of it.
J 101
Module
RS 232
Level Match
3.3V/1.8 V
Level Translator
UART
DB9
J 604
RS 232
3.3 V
1.8 V
U 602
Figure 24: Block Diagram of Debug UART Port (J604)
1
2
3
4
5
6
7
8
9
Figure 25: Pin Assignment of Debug UART Port (J604)
